<![CDATA[High-strength Self-Compacting Concrete (SCC) reinforced with 1% steel fiber was investigated for its mechanical degradation at elevated temperatures of 25°C, 400°C, 500°C, and 600°C. The experimental study was conducted at Universitas Tarumanagara's Construction and Concrete Technology Laboratory using cylindrical specimens (10cm x 20cm) for compressive strength tests and beam specimens (10 cm × 10 cm × 40 cm) for flexural strength tests. Specimens were heated to target temperatures with a 2-hour dwelling time and allowed to cool naturally. Results show that at 25°C, adding 1% steel fiber decreased compressive strength by 23.3% (from 40.58 MPa to 31.14 MPa) while increasing flexural strength by 23.0%. At 600°C, steel-fiber-reinforced SCC retained 68.2% compressive strength and 60.8% flexural strength compared to only 44.5% and 18.6% for plain SCC. Visual observations confirmed progressive color changes from gray (25°C) to yellowish-gray (400°C), pale cream (500°C), and pinkish-brown (600°C), indicative of thermal decomposition phases. Steel fiber reinforcement effectively mitigated explosive spalling risk by creating micro-channels for steam release, demonstrating that 1% steel fiber significantly enhances post-fire structural integrity of high-strength SCC. Abstrak Self-Compacting Concrete (SCC) mutu tinggi berpenguat serat baja 1% diteliti degradasi sifat mekaniknya pada suhu 25°C, 400°C, 500°C, dan 600°C. Penelitian eksperimental dilaksanakan di Laboratorium Teknologi Konstruksi dan Beton Universitas Tarumanagara menggunakan benda uji silinder (10cm x 20cm) untuk uji tekan dan balok (10 cm × 10 cm × 40 cm) untuk uji lentur. Benda uji dipanaskan hingga suhu target dengan waktu tahan 2 jam kemudian didinginkan secara alami. Hasil penelitian menunjukkan bahwa pada suhu 25°C, penambahan serat baja 1% menurunkan kuat tekan sebesar 23,3% (dari 40,58 MPa menjadi 31,14 MPa) namun meningkatkan kuat lentur 23,0% (dari 5,83 MPa menjadi 7,17 MPa). Pada suhu 600°C, SCC berpenguat serat baja masih mempertahankan 68,2% kuat tekan dan 60,8% kuat lentur, jauh lebih baik dibandingkan SCC tanpa serat yang hanya menyisakan 44,5% dan 18,6%. Pengamatan visual mengkonfirmasi perubahan warna progresif dari abu-abu (25°C), abu-abu kekuningan (400°C), krem pucat (500°C), hingga cokelat kemerahan (600°C) yang mencerminkan tahapan dekomposisi termal. Serat baja terbukti efektif meminimalisasi risiko explosive spalling dengan menciptakan jalur mikro pelepasan uap air, membuktikan bahwa kadar serat 1% secara signifikan meningkatkan integritas struktural SCC mutu tinggi pasca kebakaran.]]>
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